Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A driving control circuit for detecting a threshold voltage of at least one pixel driving circuit in a display apparatus to generate a compensating signal, the at least one pixel driving circuit sequentially operating during a detecting time period and a displaying period; each at least one pixel driving circuit comprising: a driving transistor; and an organic light emitting diode (OLED) connected to a drain electrode of the driving transistor, thereby defining a node between the drain electrode of the driving transistor and the OLED; the driving control circuit comprising: a compensating circuit configured to detect a threshold voltage of the driving transistor of the at least one selected pixel driving circuit, and generate the compensating signal for compensating the threshold voltage during the detecting time period; wherein the compensating circuit comprises a selecting module and a pre-charge module, the selecting module establishes an electronic connection between one of the at least one pixel driving circuit and the pre-charge module; the pre-charge module charges the at least one selected pixel driving circuit with a constant current before a detection operation during the detecting time period; wherein the pre-charge module comprises a power source, a current mirror, and a first switch; the power source is electrically connected to the current mirror and provides a first voltage to the current mirror; the first switch electrically connects an output of the selecting module and the current mirror; during the detecting time period, the first switch turns on, the current mirror provides the constant current to charge the node of the at least one selected pixel driving circuit based on the first voltage from the power source.
This invention relates to a driving control circuit for display apparatuses, specifically for detecting and compensating the threshold voltage of pixel driving circuits in OLED displays. The problem addressed is the variation in threshold voltage of driving transistors in OLED pixels, which can lead to uneven brightness and degraded display performance over time. The driving control circuit operates during both a detecting time period and a displaying period. Each pixel driving circuit includes a driving transistor and an OLED connected to its drain electrode, forming a node between them. The circuit detects the threshold voltage of the driving transistor in selected pixel circuits and generates a compensating signal to adjust for these variations during the detecting period. The compensating circuit includes a selecting module and a pre-charge module. The selecting module connects a specific pixel driving circuit to the pre-charge module. The pre-charge module charges the selected pixel circuit with a constant current before detection. It consists of a power source, a current mirror, and a switch. The power source supplies a voltage to the current mirror, which then provides the constant current. The switch connects the selected pixel circuit to the current mirror during the detecting period, allowing the node to be charged before threshold voltage detection. This pre-charging step ensures accurate threshold voltage measurement, enabling precise compensation during display operation.
2. The driving control circuit of claim 1 , wherein each of the at least one pixel driving circuit further comprises a reset transistor, a first terminal of the reset transistor connects to the OLED and a second terminal of the reset transistor connects to a monitoring line, wherein during the detecting time period, the selecting module connects to one of the at least one pixel driving circuits by corresponding monitoring lines, the pre-charge module sequentially operates during a first sub-period and a second sub-period; during the first sub-period, the pre-charge module charges the monitoring line corresponding to the at least one selected pixel driving circuit by the monitoring line for turning on the reset transistor; during the second sub-period, the pre-charge module charges the node in the at least one selected pixel driving circuit.
This invention relates to a driving control circuit for organic light-emitting diode (OLED) displays, specifically addressing the challenge of monitoring and adjusting pixel performance during operation. The circuit includes at least one pixel driving circuit, each with a reset transistor that connects an OLED to a monitoring line. The reset transistor allows for the detection of pixel characteristics, such as voltage or current, by enabling communication between the pixel and external monitoring circuitry. During a detection time period, a selecting module connects to a specific pixel driving circuit via its corresponding monitoring line. A pre-charge module then operates in two sub-periods. In the first sub-period, the pre-charge module charges the monitoring line to turn on the reset transistor, establishing a conductive path between the OLED and the monitoring line. In the second sub-period, the pre-charge module charges an internal node within the selected pixel driving circuit, facilitating accurate measurement of pixel parameters. This two-step process ensures reliable detection of pixel performance, enabling real-time adjustments to maintain display uniformity and quality. The circuit improves OLED display reliability by providing precise monitoring and compensation mechanisms for individual pixels.
3. The driving control circuit of claim 2 , wherein the pre-charge module comprises a power source, a second power line, a third power line, a first transistor, a current mirror, a first switch, a second switch, a third switch, and a digital-to-analog converter (DAC) module; a gate electrode of the first transistor electrically connects to the DAC module through the second switch, a source electrode of the first transistor electrically connects to the second power line, and a drain electrode of the first transistor electrically connects to the current mirror through the first switch; the selecting module electrically connects to the drain electrode of the first transistor; a terminal of the third switch electrically connects to the third power line, and the other terminal of the third switch electrically connects the gate electrode of the first transistor and the second switch.
This invention relates to a driving control circuit for electronic devices, particularly for managing power distribution and current regulation in integrated circuits. The circuit addresses the challenge of efficiently controlling power delivery while minimizing energy loss and ensuring stable operation. The pre-charge module within the circuit includes a power source, multiple power lines, a transistor, a current mirror, and several switches. The transistor's gate electrode is connected to a digital-to-analog converter (DAC) module through a second switch, allowing precise control of the transistor's operation. The source electrode of the transistor connects to a second power line, while the drain electrode connects to the current mirror through a first switch. The current mirror ensures consistent current flow, enhancing stability. A selecting module is linked to the transistor's drain electrode, enabling dynamic current routing. Additionally, a third switch connects a third power line to the transistor's gate electrode and the second switch, providing flexibility in power distribution. The combination of these components allows the circuit to regulate current flow efficiently, adapt to varying power demands, and maintain stable operation in electronic devices.
4. The driving control circuit of claim 3 , wherein during the first sub-period, the third switch turns on, the first switch and the second switch turn off, and the first transistor turns on; the third power line charges the corresponding monitoring line through the first transistor and the selecting module.
This invention relates to driving control circuits for display panels, specifically addressing the challenge of efficiently charging monitoring lines in a display system. The circuit includes multiple switches and transistors to manage power distribution during different operational phases. In a first sub-period, a third switch is activated while a first and second switch remain off, allowing a third power line to charge a monitoring line through a first transistor and a selecting module. The selecting module likely routes signals to specific display elements, ensuring proper monitoring line activation. The first transistor acts as a conductive path during this phase, enabling controlled charging. This design improves power efficiency and signal integrity by isolating power lines during specific sub-periods, preventing unnecessary power dissipation. The circuit ensures accurate monitoring of display elements by maintaining stable voltage levels on the monitoring lines. The invention is particularly useful in high-resolution displays where precise control of power distribution is critical for performance and energy efficiency. The described configuration optimizes the charging process, reducing power loss and enhancing overall system reliability.
5. The driving control circuit of claim 3 , wherein the DAC module is capable of providing a first reference voltage and a second reference voltage to the gate electrode of the first transistor; during the second sub-period, the third switch turns off, and the first switch and the second switch turn on, the DAC module provides the first reference voltage, and the first transistor becomes saturated, the current mirror generates the constant current to the at least one selected pixel driving circuit based on the voltage provided by the power source; after the second sub-period, the DAC module provides the second reference voltage to the first transistor, and the first transistor turns off.
A driving control circuit for display systems addresses the challenge of precisely controlling pixel current to ensure uniform brightness and color consistency. The circuit includes a digital-to-analog converter (DAC) module that generates two reference voltages for a first transistor. During a second sub-period of operation, a third switch is turned off while first and second switches are turned on. The DAC module supplies a first reference voltage to the gate electrode of the first transistor, causing it to enter saturation mode. This enables a current mirror to generate a constant current for at least one selected pixel driving circuit, based on the voltage from a power source. After this sub-period, the DAC module switches to a second reference voltage, turning off the first transistor. This design ensures stable current delivery to pixels, improving display performance by maintaining accurate current levels and reducing power fluctuations. The circuit's ability to dynamically adjust transistor states via reference voltages enhances efficiency and reliability in display driving applications.
6. The driving control circuit of claim 1 , wherein the compensating circuit further comprises a buffering module and a processing module; the buffering module buffers a voltage from the corresponding at least one pixel driving circuit after being charged for a predetermined time; the processing module generates a compensating signal to a controller for compensating the threshold voltage of the corresponding at least one pixel driving circuit based on the buffered voltage of the buffering module.
This invention relates to a driving control circuit for display panels, specifically addressing threshold voltage variations in pixel driving circuits that can lead to uneven brightness and image quality degradation. The circuit includes a compensating circuit designed to mitigate these variations by dynamically adjusting the driving signals to each pixel. The compensating circuit comprises a buffering module and a processing module. The buffering module temporarily stores a voltage from a pixel driving circuit after it has been charged for a predetermined time. This buffered voltage reflects the threshold voltage characteristics of the pixel driving circuit. The processing module then analyzes this buffered voltage and generates a compensating signal. This signal is sent to a controller, which uses it to adjust the driving voltage or current supplied to the pixel, compensating for any threshold voltage deviations. By dynamically compensating for these variations, the circuit ensures uniform brightness and improved display performance across the panel. The system is particularly useful in organic light-emitting diode (OLED) displays, where threshold voltage shifts are common due to material degradation over time.
7. The driving control circuit of claim 1 , wherein the compensating circuit serves as an active front end (AFE) of the ADC chip.
This invention relates to a driving control circuit for an analog-to-digital converter (ADC) chip, specifically focusing on a compensating circuit that functions as an active front end (AFE). The AFE is designed to enhance signal integrity and performance in ADC applications by compensating for distortions, noise, or other signal degradation that may occur during analog signal processing. The compensating circuit actively conditions the input signal before it reaches the ADC, ensuring accurate and reliable digital conversion. This is particularly useful in high-precision measurement systems, communication devices, and other applications where signal fidelity is critical. The AFE may include amplification, filtering, or other signal conditioning techniques to optimize the input signal for the ADC's dynamic range and resolution. By integrating the compensating circuit as the AFE, the system achieves improved signal-to-noise ratio, reduced distortion, and better overall ADC performance. The invention addresses the challenge of maintaining signal integrity in noisy or high-frequency environments, ensuring that the ADC operates at its full potential.
8. The driving control circuit of claim 1 , wherein the detecting time period is a blanking time period.
A driving control circuit for display devices, particularly for liquid crystal displays (LCDs), addresses the challenge of accurately detecting display panel characteristics during operation. The circuit includes a detection unit that measures electrical properties of the display panel, such as voltage or current, to assess panel performance. A key feature is the use of a specific detection time period, which is synchronized with the display's blanking interval. The blanking interval is a brief period when the display panel is not actively updating pixel data, ensuring that measurements are taken without interference from normal display operations. This synchronization improves the accuracy of the detected panel characteristics, enabling better calibration and compensation for variations in panel behavior. The circuit may also include a control unit that processes the detected data to adjust driving signals, ensuring consistent display quality. By leveraging the blanking interval for detection, the circuit avoids disrupting the visual output while maintaining precise monitoring of the panel's electrical properties. This approach is particularly useful in high-resolution or high-refresh-rate displays where accurate real-time adjustments are critical.
9. The driving control circuit of claim 1 , wherein the detecting time period is an initial period during which the display apparatus is powered on.
Technical Summary: This invention relates to a driving control circuit for a display apparatus, specifically addressing the issue of optimizing power consumption and display performance during the initial power-on phase. The circuit includes a detection mechanism that operates during a predefined initial time period after the display apparatus is powered on. During this period, the circuit monitors and adjusts various display parameters to ensure stable and efficient operation. The detection time period is critical for stabilizing the display's electrical characteristics, such as voltage levels and signal timing, before normal operation begins. By focusing on this initial phase, the circuit prevents potential display anomalies, such as flickering or color inaccuracies, that can occur due to unstable power supply or signal delays. The circuit may also include additional features, such as temperature compensation or adaptive brightness control, to further enhance display performance. The primary goal is to ensure a smooth and reliable transition from power-on to normal operation, improving user experience and device longevity. This solution is particularly relevant for high-resolution displays where initial power fluctuations can significantly impact image quality.
10. A display apparatus comprising: a plurality of pixel driving circuits; and a driving control circuit configured to drive the plurality of pixel driving circuits; wherein the driving control circuit comprises a compensating circuit; each of the plurality of pixel driving circuits sequentially operates during a detecting time period and a displaying period; each pixel driving circuit comprises a driving transistor and an organic light emitting diode (OLED); during the detecting time period, the compensating circuit charges a node by a constant current for decreasing a time of the detecting time period, the node is connected between a terminal of the driving transistor and the OLED in each of the plurality of the pixel driving circuits, and wherein the compensating circuit comprises a pre-charge module, the pre-charge module comprises a power source, a current mirror, and a first switch; the power source is electrically connected to the current mirror and provides a first voltage to the current mirror; the first switch electrically connects an output of the selecting module and the current mirror; during the detecting time period, the first switch turns on, the current mirror provides the constant current to charge the node of the at least one selected pixel driving circuit based on the first voltage from the power source.
This invention relates to display technology, specifically addressing the challenge of reducing the detection time in organic light-emitting diode (OLED) displays to improve efficiency and performance. The display apparatus includes multiple pixel driving circuits, each containing a driving transistor and an OLED, and a driving control circuit that manages these pixel circuits. The driving control circuit features a compensating circuit designed to minimize the detection time period by charging a node between the driving transistor and the OLED with a constant current. This node is critical for detecting and compensating for variations in the driving transistor's threshold voltage, which can degrade display uniformity. The compensating circuit includes a pre-charge module with a power source, a current mirror, and a switch. The power source supplies a fixed voltage to the current mirror, which generates a constant current. During the detection phase, the switch connects the current mirror to the selected pixel circuit, allowing rapid charging of the node. This pre-charging step accelerates the detection process, reducing overall time and enhancing display responsiveness. The current mirror ensures consistent current delivery, improving accuracy in threshold voltage compensation. This approach optimizes display performance by balancing detection speed and precision, addressing a key limitation in OLED display technology.
11. The display apparatus of claim 10 , wherein the compensating circuit further comprises a selecting module; the selecting module electrically connects to the plurality of pixel driving circuits; the selecting module sequentially selects one of the pixel driving circuits, and the pre-charge module charges the node in the selected pixel driving circuit before a detection operation in the detecting time period.
This invention relates to display apparatuses, specifically addressing the challenge of improving display performance by compensating for variations in pixel driving circuits. The apparatus includes a display panel with multiple pixel driving circuits, each driving a corresponding pixel. Each pixel driving circuit has a driving transistor and a storage capacitor, where the driving transistor controls current flow to the pixel based on a voltage at a node. The apparatus also includes a compensating circuit that compensates for threshold voltage variations in the driving transistors to ensure uniform display quality. The compensating circuit includes a pre-charge module that charges the node in each pixel driving circuit to a predetermined voltage before a detection operation. This pre-charging step ensures accurate detection of the driving transistor's threshold voltage. Additionally, the compensating circuit has a selecting module that sequentially connects to each pixel driving circuit, allowing the pre-charge module to charge the node in the selected circuit before detection. This sequential selection ensures that each pixel driving circuit is properly pre-charged, improving the accuracy of threshold voltage compensation. The compensating circuit may also include a detecting module that measures the threshold voltage of the driving transistor during a detection time period, and a compensating module that adjusts the driving transistor's gate voltage based on the detected threshold voltage to compensate for variations. This compensation ensures consistent brightness and color uniformity across the display. The invention enhances display performance by mitigating the effects of transistor threshold voltage variations, leading to a more uniform and reliable display outp
12. The display apparatus of claim 11 , wherein during the detecting time period, the pre-charge module sequentially operates during a first sub-period and a second sub-period; during the first sub-period, the pre-charge module charges the monitoring line corresponding to the selected pixel driving circuit; during the second sub-period, the pre-charge module charges the node in the selected pixel driving circuit.
This invention relates to display apparatuses, specifically addressing the challenge of accurately detecting and compensating for variations in pixel driving circuits within display panels. The technology focuses on improving the pre-charge process during a detection time period to enhance the accuracy of threshold voltage compensation in organic light-emitting diode (OLED) displays. The display apparatus includes a pre-charge module that operates in two distinct sub-periods during the detection time period. In the first sub-period, the pre-charge module charges a monitoring line connected to a selected pixel driving circuit. This initial charging step ensures that the monitoring line is at a stable voltage level before further operations. In the second sub-period, the pre-charge module charges a specific node within the selected pixel driving circuit. This sequential charging process helps mitigate voltage fluctuations and improves the precision of threshold voltage detection, leading to more uniform display performance. The invention also involves a detection module that measures the voltage of the monitoring line after the pre-charge module completes its operations. This measured voltage is used to determine the threshold voltage of the driving transistor in the pixel driving circuit, enabling accurate compensation for variations in transistor characteristics. The apparatus may further include a compensation module that adjusts the driving signal based on the detected threshold voltage to ensure consistent brightness across the display panel. By implementing this two-step pre-charge process, the invention enhances the reliability and accuracy of threshold voltage detection, addressing issues related to display uniformity and image quality in OLED displays.
13. The display apparatus of claim 10 , wherein the compensating circuit comprises a plurality of selecting modules and a plurality of pre-charge modules, each selecting module electrically connects with two adjacent pixel driving circuits, and electrically connects to one of the pre-charge module; each selecting module sequentially selects one of the plurality of the pixel driving circuits, and charges the selected pixel driving circuit.
This invention relates to a display apparatus with an improved compensating circuit for driving pixel circuits. The apparatus addresses the problem of uneven charging in pixel driving circuits, which can lead to display inconsistencies such as brightness variations or response delays. The compensating circuit includes multiple selecting modules and pre-charge modules. Each selecting module connects to two adjacent pixel driving circuits and one pre-charge module. The selecting modules operate sequentially, selecting one pixel driving circuit at a time and charging it to ensure uniform and efficient power distribution. This design helps maintain consistent display performance by preventing charge imbalances between adjacent pixels. The pre-charge modules provide the necessary voltage to the selecting modules, ensuring rapid and stable charging of the pixel circuits. The system enhances display quality by reducing flicker, improving response times, and ensuring uniform brightness across the screen. The invention is particularly useful in high-resolution displays where precise control of pixel charging is critical.
14. The display apparatus of claim 10 , wherein the detecting time period is a blanking time period between two adjacent image display frames.
A display apparatus includes a display panel and a sensor configured to detect an external object, such as a user's finger or stylus, in proximity to the display panel. The sensor operates during a blanking time period between two adjacent image display frames to avoid interference with the display of visual content. The blanking time period is a brief interval when the display panel is not actively refreshing its pixels, allowing the sensor to perform its detection function without disrupting the displayed image. This approach ensures that the sensor's operation does not introduce visual artifacts or reduce display performance. The sensor may use various detection methods, such as capacitive, optical, or ultrasonic sensing, to determine the presence or position of the external object relative to the display panel. By utilizing the blanking time period, the display apparatus maintains high-quality image rendering while enabling accurate and responsive object detection for touch or proximity-based interactions. This design is particularly useful in touchscreen devices where seamless user input detection is required without compromising display quality.
15. The display apparatus of claim 10 , wherein the detecting time period is an initial period of the display apparatus being powered on.
A display apparatus includes a display panel and a sensor configured to detect an object approaching the display panel. The apparatus determines a detecting time period during which the sensor operates to detect the approaching object. In this invention, the detecting time period is specifically set as the initial period when the display apparatus is powered on. This ensures that the sensor is active only during startup, reducing unnecessary power consumption and processing load while still enabling initial object detection. The apparatus may further include a controller that processes sensor data to determine the presence of an object and adjusts display settings accordingly, such as brightness or touch sensitivity. The sensor may be an optical, capacitive, or proximity sensor, and the display panel may be an LCD, OLED, or other type. The invention improves efficiency by limiting sensor operation to the startup phase, where object detection is most relevant, while avoiding continuous monitoring during normal operation. This is particularly useful in portable or battery-powered devices where power management is critical. The apparatus may also include additional features like a touch interface or gesture recognition, which rely on the initial detection of an approaching object to trigger further interactions.
16. A driving control circuit for detecting a threshold voltage of at least one pixel driving circuit, the at least one pixel driving circuit sequentially operating during a detecting time period and a displaying period; the at least one pixel driving circuit comprising: a driving transistor; and an organic light emitting diode (OLED) connected to a drain electrode of the driving transistor, thereby defining a node between the drain electrode of the driving transistor and the OLED; the driving control circuit comprising: a compensating circuit configured to detect the threshold voltage of the driving transistor of the at least one pixel driving circuit and generate a compensating signal for compensating the threshold voltage; wherein the compensating circuit comprises a pre-charge module, the pre-charge module generates a constant current and charges the node by the constant current in the at least one pixel driving circuit before a detection operation in the detecting time period, wherein the pre-charge module comprises a power source, a current mirror, and a first switch; the power source is electrically connected to the current mirror and provides a first voltage to the current mirror; the first switch electrically connects an output of the selecting module and the current mirror; during the detecting time period, the first switch turns on, the current mirror provides the constant current to charge the node of the at least one selected pixel driving circuit based on the first voltage from the power source.
This invention relates to a driving control circuit for detecting the threshold voltage of pixel driving circuits in display panels, particularly those using organic light-emitting diodes (OLEDs). The problem addressed is the need to accurately detect and compensate for threshold voltage variations in driving transistors, which can degrade display performance over time. The solution involves a compensating circuit that pre-charges the node between the driving transistor and the OLED before detection to ensure accurate threshold voltage measurement. The pixel driving circuit includes a driving transistor and an OLED connected to its drain electrode, forming a node. The driving control circuit detects the threshold voltage of the driving transistor and generates a compensating signal to correct for variations. A key component is the pre-charge module, which generates a constant current to charge the node before detection. This module includes a power source, a current mirror, and a first switch. The power source provides a stable voltage to the current mirror, which then supplies the constant current. The first switch connects the current mirror to the node during the detecting time period, ensuring the node is properly charged before threshold voltage measurement. This pre-charging step improves detection accuracy by eliminating initial voltage discrepancies. The circuit operates in both a detecting time period (for calibration) and a displaying period (for normal operation).
Unknown
November 26, 2019
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